Method for increasing oil recovery rate through self-generation carbon dioxide system after polymer flooding

A carbon dioxide, recovery factor technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., to achieve the effects of inhibiting viscous fingering, changing the direction of liquid flow, and expanding sweep efficiency
CN106567698AInactive Publication Date: 2017-04-19CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2017-04-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for increasing the oil recovery rate through a self-generation carbon dioxide system after polymer flooding. The method for increasing the oil recovery rate through the self-generation carbon dioxide system after polymer flooding comprises the step that the self-generation carbon dioxide system and spacer fluid are injected into an oil well after polymer flooding. The self-generation carbon dioxide system and the spacer fluid are alternately injected into the oil well multiple times. According to the method for increasing the oil recovery rate through the self-generation carbon dioxide system after polymer flooding, various yield increasing principles are combined, and various technical problems are effectively solved; (1) decompression and injection augmenting effects are achieved, specifically, alkaline blockage relieving and acid blockage relieving of zones near a water injection well are achieved by injecting chemical solutions into the water well, and thus the decompression and injection augmenting effects are achieved; and (2) a heat releasing effect is achieved, so that the viscosity of crude oil is decreased, and the oil displacement efficiency is improved.
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Description

technical field

[0001] The invention relates to the field of oil and gas field development, in particular, the invention relates to a method for enhancing oil recovery by autogenous carbon dioxide system after polymer flooding. Background technique

[0002] Polymer flooding is an important technical means for stabilizing production and improving development results in my country's mature oilfields during high water-cut periods. Polymer flooding can generally increase recovery by 6%-10% on the basis of water flooding. However, after polymer flooding, there are still Nearly half of the original crude oil geological reserves have not been exploited, and the remaining oil is scattered in the formation. Therefore, how to effectively tap the remaining oil and improve oil recovery after polymer flooding is an important guarantee for the sustainable development of oil and gas fields.

[0003] At present, the technologies for enhancing oil recovery after polymer flooding include: (1) ...

Claims

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